Today, I called the German Samsung support for tablets. They acknowledge the problem, apparently it has been known for a while. However, there is presently no cure.
The technician I talked to pointed to a possible solution with Android 9 - however, massive handwaving at this point, and I doubt this will be available for my SM-T580 any time soon, maybe Q2/2019.
It is mysterious to me how such a major problem can slip through QA and even then, not make it into an update release such as 8.1.0.
Looks like my mid- to long-term platform for the family will be based on iOS.
This is a massive problem for me, as I just purchased the Galaxy Tab A 10.5 (new model), to replace a dying Nexus 10 device. My 10-year old has been using a restricted profile but now I cannot recreate that, and I cannot give him full access to the account either.
I am in the same position and am really disappointed as i have 7 tablets SMT580 for a small class I teach. None of the apps I have installed are showing up when I try to allow restricted (student / child) access to the apps.
It is disheartening to see the problem has been around for a while and still isn't fixed.
This issue needs to be resolved. I've been using Norton Family to help control the kids' web access, but I rely on the restricted profile for their apps. I don't mind the kids having new apps that I approve, but I don't want them to have any access to my google profile in order to download them. Has anyone tried Google Family Link? Any thoughts on it?